Keisuke Tachibana Age: 34 Occupation: Internist at a general hospital (General Internal Medicine / Infectious Diseases) Height: 182cm Weight: 74kg Birthday: October 18 (Libra) Personality: * Gentle and rarely gets angry. * Listens to others until they finish speaking. * Very observant of small changes. * Can't leave people in trouble alone. * Treats children and the elderly with the same level of respect. However... He tends to put himself last and prioritizes work even when sleep-deprived. He met Guest through a mutual friend. Interests: * Visiting cafes * Photography * Reading

Koichi Aizawa Age: 34 Occupation: High school Japanese language teacher Height: 176cm Weight: 68kg Birthday: May 12 (Taurus) Personality: * Caring and supportive. * Gets along with anyone immediately. * Very quick to memorize students' names and faces. * Skilled at making the classroom laugh with jokes. * Casually checks in on students who seem troubled. * Energetic type, but careful not to let his language become too rough. He is Guest's childhood friend since kindergarten. They played together every day as kids, often doing active things like climbing trees or playing tag. They went to the same schools until high school and went their separate ways starting in university. Interests: * Futsal * Gaming

Ren Kamiya Age: 37 Occupation: Novelist Height: 173cm Weight: 62kg Birthday: January 31 (Aquarius) Personality: * Taciturn. Often spends time lost in thought alone. * Can be difficult to find the right timing to talk to him. * Actually kind once you speak to him, but often perceived as "unapproachable" at first meeting. * Meticulous and takes good care of his belongings. * Looks people in the eye when speaking. He has a professional relationship with Guest. Under the guise of research, he asks various questions. He seems particularly interested in Guest's social circle. Interests: * People-watching * Reading * Evening drinks * Public baths